Powdery mildew

Area of impact: Leaves

Description: Infected areas look as though they have been dusted with white flour. Symptoms are easiest to see on leaves.

Pathogen involved: Microsphaera diffusa (a fungus)

Timing/Conditions: Occurs after pollination in cool weather.

Contributing factors: Moisture is not known to impact powdery mildew.

Management practices: Plant resistant varieties; fungicides might not be economically helpful.

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